Yarn severing device



Dec. 13, 1966 H. HAAGSMA YARN SEVERING DEVICE 5 Sheets-Sheet 1 Filed Feb. 10, 1966 5 if i: i

1 N V E NT 0 R HERMAN HHRGSMA.

ATTORNEY Dec. 13, 1966 1- M 3,290,872

YARN SEVERING DEVICE Filed Feb. 10, 1966 3 Sheets-Sheet 2 M lllllll lllllllU I A 1 N VENT OR.

HERMAN HAAGSMA.

ATTORNEY H. HAAGSMA YARN SEVERING DEVICE 5 Sheets-Sheet 5 ZNVENTO R HERMAN HRRGSIMA.

ATTORNEY Dec. 13, 1966 Filed Feb. 10, 1966 United States Patent M 3,290,872 YARN SEVERING DEVICE Herman Haagsma, Whitinsville, Mass., assignor to Draper Corporation, Hopedale, Mass, a corporation of Maine Filed Feb. 10, 1966, Ser. No. 526,464 9 Claims. (Cl. 57--53) This invention pertains to a dofiin-g mechanism for removing fully wound bob-bins from the spindles of spinning or twisting frames or other similar machines and pertains more particularly to a device for severing the strand of yarn or like material which will extend from the surface of the wound bobbin to the base of the spindle.

It is a general object of the invention to provide a severing device which is greatly simplified and which will be more positive acting than those previously known.

It is a further object of the invention to provide a simple device to sever the coarser or stronger counts of yarn.

It is a further object of the invention to provide a device which will assure the severing of the final strand of yarn or like material subsequently to the dotfing of the bobbin from its spindle.

These .and other objects of the invention will become apparent as further details are disclosed.

Prior to doffing wound bobbins from a spinning frame or the like it is customary to lower the ring rail rapidly to a low point below the butt of the bobbins. This action will allow a few downwardly spiralling wraps of yarn to be made upon the surface of the full bobbin and allow a few wraps to be made around the base of the spindle. When a bobbin is then dolled, the tension upon the yarn will in most cases eifect a break and release the bobbin. However, with coarser yarns or those with greater tensile strength, instead of breaking, the yarn may unwind and remain attached to the bobbin. The instant invention is intended to assure a yarn break at a point between the bobbin butt and the base of the spindle with all types of yarn.

The device disclosed herein is shown as applied to a doffing and donning machine such as that set forth in U.S. Patent No. 3,077,725 and the doffing operation is clearly explained in that patent. This invention would be readily applicable to any doffing apparatus whereby bobbins are individually removed from consecutive spindles along a frame.

Explanation of the doffing and donning machine of the above-cited patent will be referred to only generally in order to place the novel device in its proper operative position.

The invention will be described by reference to specific embodiments thereof as illustrated in the accompanying figures of drawing, wherein:

FIG. 1 is a rear elevation of a dofling and donning machine having a severing device attached and showing that side of the machine which faces a spinning frame;

FIG. 2 is an enlarged portion of FIG. 1 in perspective as viewed through a row of spindles;

FIG. 3 is a front elevation, in perspective, of the severing device in position upon a dofiing machine; and

FIG. 4 is a modification of a portion of the device shown in FIG. 3.

Now referring to FIGS. 1 and 2, a doffing and donning machine, generally designed 20, is shown with the instant invention applied thereto. It will be understood that only the dofling operation is involved with the device of this application so that a machine for that purpose alone might be used with satisfactory results. The machine 20 is adapted to move horizontally by wheels 21 and 22 rolling upon a spinning frame rail (not shown) in a known manner. A fragmental portion of a spinning frame is shown as a row of spindles 23 extending upward- 3,290,872 Patented Dec. 13, 1966 1y through a ring rail 24 with a series of wound bobbins 25 in the various positions assumed during a dotf.

A loosening cam 26 and a bobbin raising cam 27 are movably fixed to the machine 20 in such a manner that they may both be moved toward and away from the row of bobbins 25. At the start of a doif, the machine 20 having been placed upon a spinning frame, the two cams 26 and 27 are moved toward the row of spindles 23 to be in line with the butts of the filled bobbins. As the machine 20 is then moved parallel to the rail 24, the cam 26 will loosen each bobbin on its spindle 23 and each will ride up the edge 28 of the cam 27. An explanation of the dofiing operation to this point is more specifically set forth in the US. Patent No. 3,176,458.

A yarn severing device, generally designated 29 (FIG. 3), is fixed to the machine 20 to be movable therewith and so as to be movable with the cams 26 and 27 toward and away from the row of spindles 23. A bobbin supporting track 30 having enclosing side members 31 and 32 is fastened to form a continuing path from that of the raising cam edge 28. The track 30 curves forwardly of the machine 20 with its width being sufficient to allow bobbin butts to slide freely therethrough.

It will be seen in viewing FIGS. 2 and 3 that when a bobbin has reached the top of the raising cam 27, it will be free of the spindle 23 whereupon it will rest upon the track 30. It will for the moment drop back slightly and be stopped by a slide-back guard 33 formed by a curved portion of the side 31. That particular bobbin will remain there until it is moved along the track 30 by a subsequent bobbin taking its place.

A front guiding Wall 34 is fastened in an upright position generally above the side member 311 and a rear guiding wall '35 is fixed opposing wall 34 and generally above the side 32. The walls 34 and 35 form a passageway through which the intermediate body of a wound bobbin may pass. The wall 35 is fastened to a supporting arm 36 (FIG. 3) as by screws 37. A leaf spring 38 is fastened to the arm 36 so that its free and 39 extends flexibly into the passageway between walls 34 and 35. The free end 39 will reduce the width of the passageway by pressing the bobbins forwardly against the wall 34. Fixed to the free end 39 is a pad 40 of any suitable high friction material which may be of rubber, leather or of a similarly acting plastic material. The purpose of the pad is to restrain each bobbin from rotating or unwinding the yarn as it passes through the guiding channel.

The supporting track 30 has a notched shoulder 41 upon its rearwardly facing edge as seen in FIG. 3. As each bobbin is deposited upon the track 30 (FIG. 2), and provided the downwardly extending wrap of yarn 42 has not yet broken, the shoulder 41 will trap the yarn as the machine 20 moves along the row of spindles. The pad 40 together with the subsequent bobbins will restrain each bobbin from rotating or unwinding yarn and, as each is moved away from its spindle, the tension on the yarn will cause it to break. The bobbins are. urged along the passageway and the track 30 by the subsequent bobbins being forced up the raising cam 27 and each will drop into a receiving container (not shown) placed in position for that purpose.

'In FIG. 4 a yarn severing shoulder having a knife-like edge 43 is shown as a modification which may be substituted where yarn of exceptional strength is being dolfed. In either instance the invention provides a simplified means for severing the strand of yarn which may still connect the wound bobbin with the base of its spindle after having being dotted by mechanical means.

While one embodiment and a modification of the invention have been disclosed, it is to be understood that the inventive concept may be carried out in a number of ways. This invention is, therefore, not to be limited to the precise details described, but is intended to embrace all variations and modifications thereof falling within the spirit of the invention and the scope of the claims.

I claim:

1. For a bobbin doiiing machine having a bobbin raising cam movable with said machine along a parallel row of spindles, a yarn severing device comprising (a) a bobbin butt supporting track disposed generally as a continuation of said raising cam,

(b) a bobbin guiding channel above said supporting track for directing the bobbins away from said row of spindles, and

(c) a bobbin engaging member for restraining from rotation each bobbin while being moved along said track and said channel.

2. The mechanism of claim 1 wherein said supporting track includes a yarn severing shoulder for positioning the end of yarn to be severed which extends from the dotted bobbin to the base of a spindle.

3. The mechanism of claim 2 wherein said severing shoulder defines a knife-like edge for cutting the extending end of yarn.

4. The mechanism as defined in claim 1 wherein said guiding channel comprises a pair of opposing upright walls forming a passageway therebetween, and said bobbin engaging member being secured between said pair of Walls thereby reducing the extent of passageway therethrough.

5. The mechanism as defined in claim 4 wherein said bobbin engaging member includes a leaf spring having one end fastened to one wall of said pair of walls and a second end flexibly extending into said passageway.

6. The mechanism as defined in claim 4 wherein said bobbin engaging member includes a contacting surface of high friction material for holding a bobbin from rotation during its movement through said passageway.

7. Mechanism as defined in claim 1 which further comprises (a) a yarn severing shoulder for positioning the end of yarn to be severed which extends from the dotted bobbin to the base of a spindle,

(b) said guiding channel including a pair of opposing upright walls forming a passageway therebetween,

(c) said bobbin engaging member being secured between said pair of walls thereby reducing the extent of passageway therethrough,

((1) said member including (1) a leaf spring having One end fastened to one wall of said pair of walls,

(2) a second end flexibly extending into said passageway, and

(3) a bobbin contacting surface of high friction material secured to said second end for holding a bobbin from rotation during its movement through said passageway.

8. The mechanism of claim 1 which further includes a bobbin slide-back guard for retaining the doifed bobbin upon the said supporting track.

9. The mechanism of claim 7 wherein said supporting track includes a bobbin slide-back guard for retaining the dotted bobbin upon the said supporting track.

References Cited by the Examiner UNITED STATES PATENTS 2,653,440 9/1953 Partington 57 53 3,077,725 2/1963 Du Buis er al 57 53 3,175,349 3/1965 Prat 57-53 3,176,458 4/1965 Dubois et al 5753 FRANK J. COHEN, Primary Examiner.

A. J. SIDOTI, Assistant Examiner. 

1. FOR A BOBBIN DOFFING MACHING HAVING A BOBBIN RAISING CAM MOVABLE WITH SAID MACHINE ALONG A PARALLEL ROW OF SPINDLES, A YARN SEVERING DEVICE COMPRISING (A) A BOBBIN BUTT SUPPORTING TRACK DISPOSED GENERALLY AS A CONTINUATION OF SAID RAISING CAM, (B) A BOBBIN GUIDING CHANNEL ABOVE SAID SUPPORTING TRACK FOR DIRECTING THE BOBBINS AWAY FROM SAID ROW OF SPINDLES, AND (C) A BOBBIN ENGAGING MEMBER FOR RESTRAINING FROM ROTATION EACH BOBBIN WHILE BEING MOVED ALONG SAID TRACK AND SAID CHANNEL. 